Unscramble Rref

What is the meaning of word rref unscrambled?

What 4 letter words can be made from letters R R E F:

Make more words by adding or removing letters

How many 3 letter words can you make from letters R R E F?

1. err - Definition of err

2. fer - Definition of fer

3. ref - Definition of ref

Which 3 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter R and unscrambling ref
2) Removing the letter R and unscrambling ref
3) Removing the letter E and unscrambling rrf
4) Removing the letter F and unscrambling rre

More anagrams containing the letters R R E F
rrfe efrr efrr rrfe